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(No Model.) 2 SheetsSheet 1.

'A, J. JOHNSON. LATHEGHUGK.

No. 605,166. Patented June-'7, 1898.

6 INVENTEIR;

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A J. JOHNSON. LATHE 011mm.

No; 605,166. Patented June 7,1898. I

|N\'/ENIEJRI UNITED STATES "PATENT OFFICE.

- aco, or SAME PLACE.

ANDREW J. JOHNSON, or OLEVELANROHIO, ASSIGNOR TO J. o nson LATHE-CHUCK.

SPECIFICATION forming part of Letters Patent No. 605,166, dated June 7, 1898.

Application filed October 16, 1897. Serial No. 655,402. (No model.) I

formed upon an obtuse angle and in such manner that the portion-which is depressed will To all whom it may concern:

Be it known that I, ANDREW J, JOHNSON,

a citizen of the United States, residing at Cleveland,-in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Lathe-Chucks, of which the following, with the accompanying drawings, is a specification. l

This invention relates to certain new an useful improvements in chucks. I

The invention has for its object the construction of a chuck the jaws orgri p of which may be opened or closed without removing it from or stopping the machinery to which it may be attached, thus rendering it possible for the operator to feed up the material being operated upon without being required to stop his machine for that purpose.

To this end the invention consists in the peculiar construction and arrangement of parts whereby the grip-jaws may be advanced or retracted while the chuck is in motion and in the combinations of the various parts, all as more fully hereinafter described, and pointed out in the claim.

Figure 1, Sheet 1, is a front end elevation of myimproved chuck, showing the spannerlever, by means of which it is operated. j Fig.

2, Sheet 2, is a central vertical section through the axial center of my improved chuck. Fig. 3, Sheet 2, is a cross-section on the line in m of Fig. 2.

A represents the body of the chuck, the rearv end of which is provided with the usual means for attaching it to a lathe spindle, while itsouter or front end is provided with the usual cap-piece B, through which the gripjaws D operate.

Fitted within the bore of the body A thereis a-sleeve or sliding member 0, into which the inner end of the grip D is threaded, as shown.'

E represent whatI denominate tumblers, and they. are received in recesses formed in and through the body A, being secured in place by means ofthepins F and upon which they may be oscillated. The inner ends of these tumblers E engage recesses formed in the sleeve-or sliding member 0. rThe outer ends of the faces of these tumblers E are be parallel with the outer periphery of the y G represents an actuating-ring which is designed to fit snugly over the outer ends of the tumblers E, but adapted to have a movement thereon in the longitudinal direction of the chuck and is designed to rotate therewith. In the periphery ofthis ring G there is formed an annular recess to receive a supplemental ring H, from which there projects the trunnions J, the latter engaging a spanner-lever K, the lower arm L of which is designed to be pivotally secured to the machine-frame, while its upper arm M is within easy reach of the operator.

In Fig. 2 the jaws or grip are shown as in their retracted position. The rod or material to be operated upon being inserted between the jaws, the ringG is forced rearwardly, sliding upon the tumblers E and causing the latter to rock or oscillate upon their pins, the inwardly-projecting ends of the tumblers being thereby forced forward, compelling the sliding member '0 to advance and force the jaws D through the contracted opening of the cap B and by reason of the construction compelling said jaws to firmly grip the material or rod.

In the operation of the machine the ring G is designed to rotate with the chuck, while the ring H is prevented from such rotation by the spanner-lever and trunnions. If it is desired to feed the material, the operator merely forces the ring G forward into the position shown in Fig. 2, which action compels the retraction of the jaws through the action of the tumblers, thus releasing the material from the jaws and leaving it free tobe pushed forward through the chuck.

What I claim as my invention 'is- In a device of the characterldescribed, the combination of the chuck-body A,adapted to be removably secured to the spindle of a lathe, a sleeve 0 slidingly engaging the bore of said body A and adapted to receive a gripjaw-D, the periphery of which is tapered or wedge shape at its outer end, a removable cap B, upon the outer end of the chuck-body the manner, and for the purpose, substantially as described.

In testimony whereof I afiix my signature, in presence of two witnesses, this 28th day of July, 1897.

A. J. JOHNSON.

Vitnesses:

H. S. SPRAGUE, S. A. CooK. 

